A substance which gives brick red flame and breaks down on heating to give
oxygen and a brown gas is

1. Magnesium nitrate

2. Calcium nitrate

3. Barium nitrate

4. Strontium nitrate

A chemical A is used for the preparation of washing soda to recover ammonia. When ${\mathrm{CO}}_2$ is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?

1. $\mathrm{Ca}{\left({\mathrm{HCO}}_3\right)}_2$

2. CaO

3. $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

4. ${\mathrm{CaCO}}_3$

Match the elements given in Column I with the properties mentioned in Column II.

  Column I                   Column II

1. Li                        (a) Insoluble sulphate

2. Na                      (b) Strongest monoacidic base

3. Ca                      (c) Most negative ${\mathrm{E}}^{\oplus }$ value among alkali metals.

4. Ba                      (d) Insoluble oxalate

                              (e) $6{\mathrm{s}}^2$ outer electronic configuration

1. (1)→ (a), (2)→ (d), (3)→(c), (4)→(b), (e)

2. (1)→ (c), (2)→ (b), (3)→(d), (4)→(a), (e)

3. (1)→ (e), (2)→ (b), (3)→(a), (4)→(c), (d)

4. (1)→ (a), (2)→ (d), (3)→(c), (4)→(b), (e)

Match the elements given in Column I with the colour they impart to the
flame given in Column II.

  Column I                     Column II

1. Cs                         (a) Apple green

2. Na                         (b) Violet

3. K                           (c) Brick red

4. Ca                         (d) Yellow

5. Sr                         (e) Crimson red

6. Ba                         (f) Blue

1. (1)→ (f),(2) → (d),(3) → (b),(4) → (c),(5)→ (e),(6) → (a)

2. (1)→ (a),(2) → (d),(3) → (c),(4) → (b),(5)→ (f),(6) → (e)

3. (1)→ (b),(2) → (a),(3) → (d),(4) → (e),(5)→ (c),(6) → (f)

4. (1)→ (d),(2) → (c),(3) → (e),(4) → (a),(5)→ (f),(6) → (b)

Which nitrate cannot give light brown gas on heating?

Na₂CO₃ can be manufactured by Solvay’s process but K₂CO₃ cannot be, because

1. K₂CO₃ is more soluble

2. K₂CO₃ is less soluble 

3. KHCO₃ is more soluble than NaHCO₃

4. KHCO₃ is less soluble than NaHCO₃

Which of the following metal bicarbonates does not exist as solid?

1. LiHCO₃

2. KHCO₃

3. RbHCO₃

4. NaHCO₃

Which of the  following metal is most commonly used in photochemical cells?

1. Lithium

2. Calcium

3. Caesium

4. Fransium 

Which of the following is ‘dead burnt plaster’?

1. CaCO₃

2. CaSO₄ . 1/2H₂O

3. CaSO₄ . 2H₂O

4. CaSO₄

Which of the following substances can be used for drying gas?